If there were three possible values `(-1//2,0,+1//2)` for the spin magnetic quantum number , ` m_s` how many elements would there be in the ` 4 th` period of periodic table ?

Explanation

To determine how many elements would be in the 4th period of the periodic table if there were three possible values for the spin magnetic quantum number \( m_s \), we can follow these steps:

### Step 1: Understand the structure of the periodic table
The periodic table is organized into periods (rows) and groups (columns). Each period corresponds to the filling of electron shells.

### Step 2: Identify the principal quantum number (n)
For the 4th period, the principal quantum number \( n \) is 4.

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